Effect of pressure on the structure of multispin complexes

Abstract

Changes in the hydrostatic pressure may significantly affect the spin dynamics of magnetically active compounds. Hence, objects exhibiting spin transitions have attracted attention of researchers in different fields. Since these transitions are reversible and do not cause the chemical decomposition of the compounds, spin state conversions can be responsible for the functional activity of materials as data storage media, external stimulus sensors or actuators for certain solid-state processes. Moreover, multispin compounds can demonstrate specific structural dynamics that is not inherent in diamagnetic compounds, which is of independent interest. The review presents the analysis of recent data on the effect of hydrostatic pressure on the crystal structure and magnetic properties of metal complexes with organic diamagnetic and paramagnetic ligands, exhibiting spin transitions and valence tautomerism, organic paramagnets and single-molecule magnets. The bibliography includes 179 references.

Thermochromism of rapid responses to temperature changes versus mechanochromism in a Ni-dithiolene complex salt

“…For instance, hydrostatic pressure can induce spin crossover behavior in many thermotropic spin crossover compounds. [19][20][21] Additionally, a carborane, in which o-carborane is covalently connected with an anthryl moiety, has been observed to exhibit reversible tricolor fluorescence switching and pressure-triggered temperaturedependent twisted intermolecular charge transfer emission. 22 In a previous study, we provided a brief report on the crystal structure and dielectric spectra of a metal-dithiolene salt, [C 8 -4,4′-BiPy][Ni(mnt) 2 ] (C 8 -4,4′-BiPy + = 1,1′-dioctyl-4,4′-bipyridinium and mnt 2− = maleonitriledithiolate).…”

“…For instance, hydrostatic pressure can induce spin crossover behavior in many thermotropic spin crossover compounds. 19–21 Additionally, a carborane, in which o -carborane is covalently connected with an anthryl moiety, has been observed to exhibit reversible tricolor fluorescence switching and pressure-triggered temperature-dependent twisted intermolecular charge transfer emission. 22…”

Quantum Stirling engine based on dinuclear metal complexes

“…As shown in [57], applying a hydrostatic pressure resulted in a considerable deformation and modification of the structure in this metal complex, which is reflected in a change in the magnetic coupling between metallic centers [57]. As pointed out in section 2, this fact is true, especially for bond distances and angles between the metallic center and the bridging ligands [39,58]. In this scenario, structural changes manifest in the magnetic behavior of the complexes, as shown by the magnetic susceptibility measurements reported.…”

“…In particular, for dinuclear metal complexes, it is well known that its magnetic coupling can be handled by applying an external pressure [5,39,42,45,[56][57][58]. Studying the magnetic properties of metal complexes when the compound are subjected to an external hydrostatic pressure is the main purpose of the high-pressure magnetometry area [57,59,60].…”

“…Hence, one can manipulate the magnetic coupling (J) of the working substance during a thermodynamic process. Accordingly, the external pressure induces a change in the lattice parameter, and the bridging angles [39,[56][57][58]; and, as a consequence, the magnetic coupling constant can be handled, which allows the control of the energy levels. Therefore, this approach allows the investigation of the relationship between the structure and magnetic properties of metal complexes.…”